Dihydroxyacetone-based emulsion and its use in cosmetics

ABSTRACT

Stable skin coloring cosmetic emulsion comprising A) from 50 to 92% by weight, based on the total emulsion weight, of an aqueous phase containing from 0.5 to 10% by weight, based on the total emulsion weight, of dihydroxyacetone and B) from 8 to 50% by weight, based on the total emulsion weight, of a fatty phase comprising from 5 to 15% by weight of isoparaffin or poly-α-olefin, from 3 to 7% by weight of an emulsifying agent consisting of a mixture of saturated or unsaturated sorbitol and glycerol esters of C 18  fatty acids with a straight or branched chain, optionally including hydroxyl, said esters being oxyethylenated and oxypropylenated, the total number of ethylene oxide and propylene oxide being less than or equal to 5, and from 0 to 15% by weight of the additional fatty bodies, all of the percentages being based on the total emulsion weight. The water-in-oil emulsion can be used to obtain a triple water-in-oil-in-water emulsion.

This application claims benefit of international applicationPCT/FR94/00341, filed Mar. 28, 1994.

The invention relates to an emulsion based on dihydroxyacetone or DHAand to the process for coloring the skin using such an emulsion.

Dihydroxyacetone or DHA is commonly used as an agent for artificiallytanning the skin. In order to be applied uniformly to the skin, DHA ispreferably formulated in the form of an emulsion, such as a cream ormilk.

However, formulations in the emulsion form present problems ofpreservation on storage, in particular of stability and of developmentof color with time. Thus, it was possible to observe an instability ofthe emulsion with time, in particular when it is brought to 45° C., anda development in the coloring towards the yellows and the ambers, inparticular after storing for six weeks at 45° C.

In addition, as such an emulsion is applied to the skin, research isdirected at reducing the concentration of emulsifiers, which can beirritating, by as much as possible. Such an emulsion must additionallyhave good cosmetic properties, that is to say be easy to spread andnonsticky after application, and have good resistance to water.

The DHA-based emulsions proposed until now generally present problems ofpreservation after a few days or a few weeks at 45° C., take on anundesirable yellow or amber coloring or alternatively have thedisadvantage of being sticky after application.

The Applicant company has discovered that by using a very specificemulsifier, in specific proportions, in a water-in-oil emulsioncontaining the DHA in the aqueous phase, the emulsifier being introducedinto the fatty phase of the emulsion comprising specific proportions ofisoparaffin or poly-α-olefin and optionally of silicone and ofadditional fatty substances, a composition for coloring the skin wasobtained in the form of a water-in-oil emulsion which is stable onstorage, which exhibits weak yellowing with time, which isnonirritating, which has good resistance to water and which has goodcosmetic properties insofar as it is easy to spread and is nonstickyafter application. In addition, this emulsion gives the skin anaesthetically improved coloring.

The subject of the invention is therefore a stable cosmetic emulsion forcoloring the skin, of the water-in-oil type, consisting of:

A) 50 to 92% by weight, on the basis of the total weight of emulsion, ofan aqueous phase comprising 0.5 to 10% by weight of dihydroxyacetone,and

B) 8 to 50% by weight, on the basis of the total weight of the emulsion,of a fatty phase comprising 5 to 15% by weight of isoparaffin or ofpoly-α-olefin and 3 to 7% by weight of an emulsifier consisting of amixture of sorbitol and of glycerol esters of saturated or unsaturated,straight- or branched-chain C₁₈ fatty acids, optionally containing ahydroxyl radical, these esters being oxyethylenated and oxypropylenated,the total number of ethylene oxide and of propylene oxide units beingless than or equal to 5,

all the percentages being given on the basis of the total weight of theemulsion.

The emulsion according to the invention may also contain, in the fattyphase, up to 10% by weight of silicone and/or up to 15% by weight, onthe basis of the total weight of the emulsion, of additional fattysubstances such as C₈ -C₂₂ fatty acids, fatty alcohols, for examplelauryl, cetyl, myristyl, stearyl, palmityl and oleyl alcohols, as wellas 2-octyldodecanol, fatty acid esters, such as glyceryl monostearateand polyethylene glycol monostearate, and the triglycerides of C₆ -C₁₈fatty acids, such as the triglycerides of caprylic/capric acid (Miglyol812).

Dihydroxyacetone or DHA is present in the water-in-oil emulsionaccording to the invention in proportions which are sufficient to conferon the skin, after application, a coloring similar to the coloringobtained following natural tanning. It is generally present inproportions of between 0.5 and 10% by weight with respect to the totalweight of the emulsion and preferably between 1 and 7% by weight.

A preferred emulsifier according to the invention is thepolyoxyethylenated (2.5 mol of ethylene oxide) and polyoxypropylenated(1.5 mol of propylene oxide) derivative of a mixture of the glycerol andof the sorbitol esters of hydroxystearic and isostearic acids, soldunder the name "Arlacel 780" by the Company ICI.

The cosmetic water-in-oil emulsion according to the invention can beused to prepare a triple W/O/W, that is to say water-in-oil-in-water,emulsion. In such a triple emulsion, the percentage of primary W/Oemulsion varies from 55 to 80% by weight with respect to the totalweight of the triple emulsion. The stability of this triple emulsion isprovided for by adding an emulsifier of the poly(ethyleneoxide)/poly(propylene oxide) block copolymer type in proportions of 0.75to 2% by weight with respect to the total weight of the triple emulsion.

This block copolymer is dissolved in the continuous external aqueousphase of the triple emulsion. If necessary, the external aqueous phasecan contain a thickener, such as a cellulose derivative.

Another subject of the invention is therefore the use of the above W/Oemulsion in the preparation of a triple W/O/W emulsion.

Another subject of the invention consists of a stable cosmetic emulsionfor coloring the skin, of the triple W/O/W emulsion type, containing 55to 80% by weight of the above W/O emulsion in 45 to 20% by weight, onthe basis of the total weight of the triple emulsion, of a continuousexternal aqueous phase containing 0.75 to 2% by weight, with respect tothe total weight of the triple emulsion, of an emulsifier of thepoly(ethylene oxide)/poly(propylene oxide) block copolymer type andoptionally a thickener.

A further subject of the invention is the process for coloring the skinusing a W/O cosmetic emulsion as defined above or the triple W/O/Wcosmetic emulsion obtained from the latter.

The isoparaffin or the poly-α-olefin used in the fatty phase of thecosmetic emulsion according to the invention belongs to the followinggroups of compounds:

isoparaffins with a dynamic viscosity of less than 0.5 Pa·s,corresponding to the formula: ##STR1## in which n is between 2 and 16,and their mixtures with oils of identical structure, in which n isgreater than 18 and preferably between 18 and 40; such oils are sold bythe Company Presperse Inc. under the names "Permethyl 99A, 101A, 102A,104A and 106A", or by the Company ICI under the name "Arlamol HD";mention may also be made of the "Isopars" sold by the Company ExxonInc.;

the poly-α-olefins of polydecene type, which may or may not behydrogenated; such products are sold by the Company Ethyl Corporationunder the name "Ethylflo"; mention is also made of polyisobutylenes,which may or may not be hydrogenated.

When the emulsion contains silicones, the latter areorganopolysiloxanes, such as organopolysiloxane oils or organicsolutions containing organosiloxane gums and/or resins.

Mention may be made, among these silicones, of volatile silicones havinga boiling point between 60° C. and 260° C., such as cyclic siliconescontaining from 3 to 7 silicon atoms or linear volatile silicones havingfrom 2 to 9 silicon atoms and having a kinematic viscosity of less thanor equal to 5×10⁻⁶ m² /s at 25° C.

The nonvolatile silicones are composed mainly of polyalkylsiloxanes,polyarylsiloxanes, polyalkylarylsiloxanes, copolymers ofpolyethersiloxanes, which may or may not be modified, silicone gums andresins and organo-modified polysiloxanes, as well as their mixtures.

Mention may be made, among polyalkylsiloxanes, of:

linear polydimethylsiloxanes with a kinematic viscosity greater than10⁻¹ m² /s which may contain trimethylsilyl, trihydroxysilyl orhydroxydimethylsilyl end groups;

polyalkylarylsiloxanes, such as linear and/or branchedpolydimethylphenylsiloxanes or polymethyldiphenylsiloxanes with akinematic viscosity of 10⁻⁵ to 5.10⁻² m² /s at 25° C.;

poly(C₁₀ -C₃₀)alkylsiloxanes containing trimethylsilyl end groups;

copolymers of polyethersiloxanes, which may or may not be modified, aresic! chosen in particular from copolymers of ethylene oxide and/or ofpropylene oxide with a diorganosiloxane, such as dimethicone copolyols;

silicone gums are sic!, inter alia, polydiorganosiloxanes with amolecular mass of between 200,000 and 1,000,000, used alone or as amixture, in a solvent chosen from volatile silicones,polydimethylsiloxane oils, polyphenylmethylsiloxane oils, isoparaffins,dodecane, tridecane, tetradecane or their mixtures;

organopolysiloxane resins which can be used in accordance with theinvention are sic! crosslinked siloxane systems containing R₂ SiO_(2/2),RSiO_(3/2) and SiO_(4/2) units in which R represents a hydrocarbon grouphaving from 1 to 6 carbon atoms or a phenyl group; the hydrocarbon grouppreferably denotes a C₁ -C₄ alkyl radical;

organomodified silicones are sic! chosen in particular from theabovementioned silicones containing in their general structure one or anumber of organo-functional groups attached directly to the siloxanechain or attached via a hydrocarbon radical. Mention may be made, forthis purpose, of silicones containing perfluorinated groups, such astrifluoroalkyl groups, hydroxylated groups, such as polyorganosiloxanescontaining hydroxyalkyl functional groups, alkoxylated groups oracyloxyalkyl groups.

Particularly preferred polyorganosiloxanes are chosen from:

nonvolatile silicones of the linear polyalkylsiloxane type containingtrimethylsilyl end groups, like the "Silbione" oils of the 70 047 and 47series, such as 47V 500,000 oil, marketed by the Company Rhone-Poulenc,or the "DC 200 Fluid" oil from the Company Dow Corning;

mixtures of organopolysiloxanes and of volatile cyclic silicones such asthe products Q2 1 401 or Q2 3225C from the Company Dow Corning or SF1214 Silicone Fluid from the Company General Electric;

dimethicone copolyols such as the product Q2 5220 from the Company DowCorning;

fluorosilicones of polyalkylsiloxane type containing trimethylsilyl endgroups and substituted on the chain by trifluoropropyl groups, such asthe fluorosilicone sold by the Company Shin Etsu under the name "X22-821";

linear or cyclic volatile silicones and more particularlydecamethylcyclopentasiloxane and its mixtures, for example the products"DC 245 Fluid" and "DC 345 Fluid" from the Company Dow Corning.

According to a preferred embodiment, the cosmetic emulsion according tothe invention contains fat-soluble or water-soluble UV-B and/or UV-Asunscreens. It may also contain polymer screening agents and/or siliconescreening agents, such as those described in French Patent ApplicationNo. 2,680,683.

The sunscreens are chosen in particular from cinnamic derivatives, suchas, for example, 2-ethylhexyl p-methoxycinnamate; salicylic derivatives,such as, for example, 2-ethylhexyl salicylate; camphor derivatives, suchas, for example, (4-methylbenzylidene)camphor or benzene-1,4-di(3-methylidene-10-camphorsulfonic)! sic! acid; benzimidazolederivatives, such as 2-phenylbenzimidazole-5-sulfonic acid; triazinederivatives, such as 2,4,6-trisp-(2'-ethylhexyl-1'-oxycarbonyl)anilino)-1,3,5-triazine sic!;benzophenone derivatives, such as 2-hydroxy-4-methoxybenzophenone;dibenzoylmethane derivatives, such as4-tert-butyl-4'-methoxydibenzoylmethane, or β,β-diphenylacrylatederivatives, such as 2-ethylhexyl α-cyano-β,β-diphenylacrylate.

These sunscreens are used in proportions of between 0.01 and 15% byweight with respect to the total weight of the emulsion.

In addition to water, the cosmetic emulsion according to the inventionmay contain, as solvents, up to 5% by weight, on the basis of the totalweight of the emulsion, of one or a number of alkylene glycols, forexample ethylene glycol, propylene glycol and diethylene glycol.

The emulsion in accordance with the invention may also contain any otheradjuvant commonly used in cosmetic compositions for the skin and moreparticularly humectants, such as polyols, for example glycerin orsorbitol, metal oxide pigments and nanopigments, emollients, vitamins,antioxidants, agents for stabilizing the primary emulsion, for examplesodium chloride, magnesium chloride, magnesium sulfate or the productnamed "Elfacos C 26", sold by the Company Akzo Chemie, which is an esterof hydroxyoctacosanyl alcohol and of hydroxystearic acid, and fragrancesand preservatives.

The solvents, fatty substances or adjuvants used in the emulsions inaccordance with the invention must not contain either a primary orsecondary amine group or an oxidizing group capable of interfering withDHA.

The emulsion according to the invention may also contain, or be usedjointly with, substances which can have a tinting or additional coloringeffect on the skin in combination with the DHA. To this end, it ispossible in particular to use hydroxyindoles or melanin pigments ofnatural or synthetic origin.

The process for coloring the skin which is another subject of theinvention is essentially characterized in that an emulsion as definedabove is applied to the skin in amounts which are sufficient to conferon the skin a coloring which is similar to natural tanning.

The examples which follow are intended to illustrate the inventionwithout having any limiting nature.

EXAMPLE 1--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   Polyoxyethylenated (2.5 mol of ethylene                                                                3.0 g                                                oxide) and polyoxypropylenated (1.5 mol of propylene                          oxide) derivative of a mixture of the glycerol and of                         the sorbitol esters of hydroxystearic and isostearic                          acids, sold under the name "Arlacel 780" by the                               Company ICI                                                                   DHA                      4.0 g                                                Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                           0.7 g                                                "Elfacos C.sub.26 " from Akzo Chemie                                                                   3.0 g                                                Poly-α-olefin:                                                          Hydrogenated polydecene sold                                                                           7.0 g                                                under the name "Ethylflo 362 NF"                                              by the Company Ethyl Corporation                                                                       7.0 g                                                Dimethicone copolyol sold under the name                                                               5.0 g                                                "Q.sub.2 5220  sic!" by the Company Dow Corning                               Preservatives, fragrances                                                                              q.s.                                                 Water                    q.s. for 100 g                                       ______________________________________                                    

The aqueous phase is heated to 70° C. The fatty phase is also heated to70° C.

The emulsion is produced by adding the aqueous phase to the fatty phasewith vigorous stirring using a Moritz. When the temperature of theemulsion falls to approximately 40° C., the DHA, dissolved beforehand inapproximately 10 g of water, is added. Stirring is continued. Finally,the silicone and then the preservative and fragrances are added.Stirring is continued until the emulsion has completely cooled.

EXAMPLE 2--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   "Arlacel 780"          3.0 g                                                  DHA                    4.0 g                                                  Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                         0.7 g                                                  "Elfacos C.sub.26 " from Akzo Chemie                                                                 3.0 g                                                  Poly-α-olefin:                                                          Hydrogenated polydecene sold                                                                         7.0 g                                                  under the name "Ethylflo 362 NF"                                              by the Company Ethyl Corporation                                              Preservatives, fragrances                                                                            q.s.                                                   Water                  q.s. for 100 g                                         ______________________________________                                    

EXAMPLE 3--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   "Arlacel 780"            4.0 g                                                DHA                      6.0 g                                                Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                           0.7 g                                                "Elfacos C.sub.26 " from Akzo Chemie                                                                   3.0 g                                                Isoparaffin:                                                                  Isododecane sold under the                                                                             9.0 g                                                name "Permethyl 99A" by the                                                   Company Presperse Inc.                                                        Decamethylcyclopentasiloxane sold under the                                                            7.0 g                                                name "DC 245 Fluid" by the Company Dow Corning                                Preservatives, fragrances                                                                              q.s.                                                 Water                    q.s. for 100 g                                       ______________________________________                                    

EXAMPLE 4--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   "Arlacel 780"            6.0 g                                                DHA                      2.5 g                                                Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                           0.7 g                                                "Elfacos C.sub.26 " from Akzo Chemie                                                                   3.0 g                                                2-Decanoxyundecanol  sic! sold under the                                                               6.0 g                                                name "Exxal 21" by the Company Exxon                                          Mixture of dimethiconol (13%), of octamethyl-                                                          4.0 g                                                cyclotetrasiloxane and of decamethylcyclo-                                    pentasiloxane (87%) sold under the name                                       "Q.sub.2 -1401  sic!" by the Company Dow Corning                              Poly-α-olefin:                                                          Hydrogenated polydecene sold                                                                           6.0 g                                                under the name "Ethylflo 168"                                                 by the Company Ethyl Corporation                                              Preservatives, fragrances                                                                              q.s.                                                 Water                    q.s. for 100 g                                       ______________________________________                                    

EXAMPLE 5--TRIPLE W/O/W EMULSION

    ______________________________________                                        A-Primary W/O emulsion                                                        Emulsifier:                                                                   "Arlacel 780"            3.0 g                                                DHA                      5.0 g                                                Isoparaffin:                                                                  Heptamethylnonane sold under                                                                           5.0 g                                                the name "Arlamol HD" by the                                                  Company ICI                                                                   Polydimethylsiloxane with a viscosity of                                                               5.0 g                                                10.sup.-2 m.sup.2 /s sold under the name "DC 200 Fluid"                       by the Company Dow Corning                                                    Glycerin                 3.0 g                                                Preservatives, fragrances                                                                              q.s.                                                 Water                    q.s. for 60 g                                        B-Triple W/O/W emulsion                                                       EO/PO Block copolymer (Poloxamer 407)                                                                  1.0 g                                                sold by the Company ICI under the name                                        "Symperonic PE/F 127"                                                         Glycerin                 2.0 g                                                Hydroxyethylcellulose sold under the name                                                              0.3 g                                                "Natrosol 250 HHR" by the Company Aqualon                                     Preservatives, fragrances                                                                              q.s.                                                 Water                    q.s. for 100 g                                       ______________________________________                                    

The primary W/O emulsion is prepared. The secondary emulsifier,consisting of the "Symperonic PE/F127", is brought to 80° C. in 18 g ofwater. A gel is prepared with the "Natrosol 250 HHR" in the remainingwater. The "Natrosol" gel is added to the "Symperonic PE/F127" solutionand then glycerin, preservative and fragrances are added, at 20° C. Theprimary emulsion is then added to the gelled aqueous phase. Stirring isapplied until the W/O/W emulsion is obtained.

EXAMPLE 6--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   "Arlacel 780"             5.0 g                                               Isoparaffin:                                                                  Heptamethylnonane sold under                                                                            10.0 g                                              the name "Arlamol HD" by the                                                  Company ICI                                                                   Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                            0.7 g                                               "Elfacos C.sub.26 " from Akzo Chemie                                                                    3.0 g                                               Mixture of cyclic silicones:                                                  decamethyl-               5.0 g                                               cyclopentasiloxane/octamethylcyclotetra                                       siloxane/dodecamethylcyclohexasiloxane                                        sold under the name "DC 200 Fluid" by the                                     Company Dow Corning (62 to 72/4/24)                                           Mixture of polydimethylsiloxane containing                                                              5.0 g                                               polyoxyethylenated or polyoxypropylenated side                                chains (dimethicone copolyol) and of a cyclic                                 polydimethylsiloxane, sold under the name                                     "Q.sub.2 -3225  sic!" by the Company Dow Corning                              Glycerin                  3.0 g                                               DHA                       5.0 g                                               Preservatives, fragrances q.s.                                                Water                     q.s. for 100 g                                      ______________________________________                                    

EXAMPLE 7--W/O EMULSION

    ______________________________________                                        Emulsifier:                                                                   "Arlacel 780"           5.0 g                                                 Isoparaffin:                                                                  "Arlamol HD"            15.0 g                                                Mixture of cyclic silicones "DC 345 Fluid"                                                            10.0 g                                                from Dow Corning                                                              Stabilizers:                                                                  Magnesium sulfate 7H.sub.2 O                                                                          0.7 g                                                 "Elfacos C.sub.26 " from Akzo Chemie                                                                  3.0 g                                                 DHA                     5.0 g                                                 Preservatives, fragrances                                                                             q.s.                                                  Water                   q.s. for 100 g                                        ______________________________________                                    

I claim:
 1. Stable water-in-oil cosmetic emulsion for coloring the skin,characterized in that it comprises:A) 50 to 92% by weight, on the basisof the total weight of emulsion, of an aqueous phase comprising 0.5 to10% by weight of dihydroxyacetone, on the basis of the total weight ofthe emulsion, and B) 8 to 50% by weight, on the basis of the totalweight of the emulsion, of a fatty phase comprising 5 to 15% by weightof isoparaffin or of poly-α-olefin and 3 to 7% by weight of anemulsifier consisting of a mixture of sorbitol and of glycerol esters ofsaturated or unsaturated, straight- or branched-chain C₁₈ fatty acids,optionally containing a hydroxyl, these esters being oxyethylenated andoxypropylenated, the total number of ethylene oxide and of propyleneoxide units being less than or equal to 5, all the percentages beinggiven on the basis of the total weight of the emulsion.
 2. Cosmeticemulsion according to claim 1, characterized in that dihydroxyacetone isused in proportions of between 1 and 7% by weight with respect to thetotal weight of the emulsion.
 3. Cosmetic emulsion according to claim 1,characterized in that it additionally contains up to 10% by weight ofsilicone.
 4. Cosmetic emulsion according to claim 1, characterized inthat it additionally contains up to 15% by weight of fatty substanceschosen from C₈ -C₂₂ fatty acids, fatty alcohols, fatty acid esters andtriglycerides of C₆ -C₁₈ fatty acids.
 5. Cosmetic emulsion according toclaim 1, characterized in that the isoparaffin is chosen fromisoparaffins with a dynamic viscosity of less than 0.5 Pa·scorresponding to the formula: ##STR2## in which n is between 2 and 16,and their mixtures with oils of identical structure in which n isgreater than 18 and preferably between 18 and
 40. 6. Cosmetic emulsionaccording to any one of claims 1 to 4, characterized in that thepoly-α-olefin is chosen from poly-α-olefins of polydecene type, whichare hydrogenated or are not hydrogenated, and polyisobutylene, which arehydrogenated or are not hydrogenated.
 7. Cosmetic emulsion according toclaim 3, characterized in that the silicone is chosen from cyclic orlinear volatile silicones having a boiling point of between 60° and 260°C. and nonvolatile silicones composed of polyalkylsiloxanes,polyarylsiloxanes, polyalkylarylsiloxanes, copolymers ofpolyethersiloxanes which may or may not be modified, silicone gums andresins and organomodified siloxanes, and their mixtures.
 8. Cosmeticemulsion according to claim 1, characterized in that the emulsifier is apolyoxyethylenated, containing 2.5 mol of ethylene oxide, andpolyoxypropylenated, containing 1.5 mol of propylene oxide, derivativeof a mixture of the glycerol and of the sorbitol esters of hydroxy sic!stearic and isostearic acids.
 9. Cosmetic emulsion according to claim 1,characterized in that it also contains fat-soluble or water-soluble UV-Bor UV-A sunscreens.
 10. Cosmetic emulsion according to claim 9,characterized in that the sunscreens are chosen from cinnamates,salicylates, benzylidene camphor derivatives, benzimidazole derivates,triazine derivatives, benzophenone derivatives, dibenzoylmethanederivatives, β,β-diphenylacrylate derivatives, polymer screening agentsand silicone screening agents.
 11. Cosmetic emulsion according to claim1, characterized in that it contains cosmetically acceptable adjuvantschosen from solvents of the alkylene glycol type, humectants of thepolyol type, emollients, vitamins, antioxidants, agents for stabilizingthe primary emulsion, fragrances and preservatives, and metal oxidepigments and nanopigments.
 12. Triple water-in-oil-in-water cosmeticemulsion, characterized in that it comprises 55 to 80% by weight, on thebasis of the total weight of the triple emulsion, of primary W/Oemulsion according to claim 1 in 45 to 20% by weight, on the basis ofthe total weight of the triple emulsion, of a continuous externalaqueous phase containing 0.75 to 2% by weight, on the basis of the totalweight of the triple emulsion, of an emulsifier of the poly(ethyleneoxide)/poly(propylene oxide) block copolymer type and optionally athickener.
 13. Process for coloring the skin in order to confer on it atanning similar to natural tanning, characterized in that a water-in-oilor water-in-oil-in-water emulsion as defined in claim 1 is applied tothe skin.